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The encryption in Microsoft Office 2016 is considered safe (AES with 256-bit key) and takes a very long time to break with today's machine resources if the password is secure enough. Note that instant messaging (chat) is not suitable for password execution since the password will be stored in the message log. If you are to distribute an encrypted document via e-mail, you should share the belonging password in a different channel, eg. by SMS or by phone. Good protection will not be obtained if encrypted documents and belonging passwords are stored in the same location. Make sure you don't lose access to documents by losing passwords. When a document is encrypted it can only be read and modified by someone who knows the password. See this tutorial to get started Bear in mind before you encrypt This method still works, but a simpler and safer solution has now been introduced. Don't use this solution anymore, see information about new toolĭon't use this solution anymore, see information about new tool.